Need to addShall we rehash the agencies... please feel free to add to the list...
SDI/TDI
PADI
SSI
NAUI
BSAC
PDIC
ACUC
IANTD
PSAI
CMAS
YMCA
NASDS (no longer around but the cards are)
HSA - Handicapped SCUBA Association
Established in 1981 right here in Southern California. Early promotional video stared Jacques Cousteau and his son Jean Michel Cousteau appears in both videos. The HSA has classes conducted around the world. It targets a specific group of divers, those who wish to be certified as a HSA Dive buddy (as I am) or instructor or the handicapped who wish to be certified by instructors specially trained to do so. The usual drill is for the HSA instructor to issue both a HSA certification card and one another major agency such as PADI, NAUI, YMCA etc. The HSA card is often accepted when dive shops will not take the PADI or NAUI card as the shop can see the training is post handicap versus pre-handicap.